$(function(){
//字体随屏幕缩放进行变化
	var winwidth = $(window).width();
	if(winwidth>=640){
		winwidth=640;
	}
	$("html").css("fontSize",winwidth/160*7+"px");
	$(window).on('resize',function(){		
		var rwinwidth = $(window).width();
		if(rwinwidth>=640){
			rwinwidth=640;
		}
		$("html").css("fontSize",rwinwidth/160*7+"px");
	})
})